Kenosha Reuse Discussion Board > GURNEE, IL
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> Acromag 903MB multi-channel discrete i/o module
Acromag 903MB multi-channel discrete i/o module
This module provides twelve discrete input and/or output channels. Isolation separates the I/O, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. Both AC and DC power sources are supported with wide range, nonpolarized, diode-coupled terminals.
The open-drain outputs are intended for current-sinking or low-side switching applications. The buffered inputs are active-low. These models are the complement of the 904, 905, and 906 units which have open-source, high-side output switches and active-high inputs. Socketed pull-up resistors are easily removed or exchanged to satisfy your application requirements.
Combining flexible I/O types, wide I/O ranges, and a network interface in a single package, makes this instrument extremely powerful. Multi-channel design adds cost-efficiency and allows high-density mounting. Plus, safe, rugged construction makes these modules reliable for use in both control room and distributed field I/O applications. Custom module configurations are also possible (consult factory for details).
* For full specifications, please refer to the instruction manual available on the manufactures web site (You'll have to create a login to view it).
* INPUT: 12 channels, 0 to 35V DC range
* OUTPUT: 12 channels, 0 to 35V DC range, sinks current
* POWER: 10 to 36V DC, 24V AC
* NETWORK COMMUNICATION: Modbus-RTU high-speed RS-485
* Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
* Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
* High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
* High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
* Tandem input/output circuitry (903 models only) connects input buffers with open-drain outputs for convenient loopback monitoring of the output state
* Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
* Watchdog timers provide a configurable failsafe output state for use when host I/O communication is lost
* Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
* Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication
